add docker-compose example
diff --git a/utils/docker/entrypoint_docker-compose.sh b/utils/docker/entrypoint_docker-compose.sh
new file mode 100755
index 0000000..421444e
--- /dev/null
+++ b/utils/docker/entrypoint_docker-compose.sh
@@ -0,0 +1,68 @@
+#! /bin/bash -e
+
+# docker stop trap signals
+# https://medium.com/@gchudnov/trapping-signals-in-docker-containers-7a57fdda7d86#.5d6q01x7q
+
+pid=0
+command=""
+term_recvd=0
+
+# send SIGTERM also to the executed command in the docker container (the containernet topology)
+# SIGTERM-handler
+function term_handler() {
+ echo $command
+ pid=$(pgrep -f "$command" | sed -n 1p)
+
+ pid="$!"
+ # avoid that the process triggers its own handler by sending sigterm
+ if [ $pid -ne 0 ] && [ $term_recvd -eq 0 ]; then
+ echo "sigterm received"
+ echo $pid
+ term_recvd=1
+ kill -SIGTERM "$pid"
+ fi
+
+ wait "$pid"
+
+ # do some manual cleanup
+ # remove all containers started by son-emu
+ docker ps -a -q --filter="name=mn.*" | xargs -r docker rm -f
+ # cleanup remaining mininet
+ mn -c
+
+ sleep 5
+ exit 143; # 128 + 15 -- SIGTERM
+}
+
+# setup handlers
+# on callback, kill the last background process, which is `tail -f /dev/null` and execute the specified handler
+trap 'term_handler' SIGTERM
+
+
+service openvswitch-switch start
+
+if [ ! -S /var/run/docker.sock ]; then
+ echo 'Error: the Docker socket file "/var/run/docker.sock" was not found. It should be mounted as a volume.'
+ exit 1
+fi
+
+# this cannot be done from the Dockerfile since we have the socket not mounted during build
+echo 'Pulling the "ubuntu:trusty" image ... please wait'
+docker pull 'ubuntu:trusty'
+
+echo "Welcome to Containernet running within a Docker container ..."
+
+if [[ $# -eq 0 ]]; then
+ exec /bin/bash
+else
+ #remember command to send it also the SIGTERM via the handler
+ command=$*
+ echo $command
+ exec $* &
+ # wait indefinetely
+ while true
+ do
+ sleep 1
+ done
+ echo "done"
+fi